Calculate field length

[bqio]

Hello!

How can I implement this?

[FieldOrder(1)]
public uint NumberOfPointers { get; set; }
[FieldOrder(2)]
[FieldCount(nameof(NumberOfPointers)) + 1]
public List<uint> Pointers { get; set; }

[jefffhaynes]

You would have to use a ValueConverter. I haven't checked this but it should be something like this. See here for another example.

public class PlusOneConverter : IValueConverter
{
    public object Convert(object value, object parameter, BinarySerializationContext context)
    {
        var count = System.Convert.ToUInt32(value);
        return count + 1;
    }

    public object ConvertBack(object value, object parameter, BinarySerializationContext context)
    {
        var count = System.Convert.ToUInt32(value);
        return count - 1;
    }
}

// ...

[FieldOrder(1)]
public uint NumberOfPointers { get; set; }

[FieldOrder(2)]
[FieldCount(nameof(NumberOfPointers)), ConverterType = typeof(PlusOneConverter)]
public List<uint> Pointers { get; set; }

[bqio]

You would have to use a ValueConverter. I haven't checked this but it should be something like this. See here for another example.

public class PlusOneConverter : IValueConverter
{
    public object Convert(object value, object parameter, BinarySerializationContext context)
    {
        var count = System.Convert.ToUInt32(value);
        return count + 1;
    }

    public object ConvertBack(object value, object parameter, BinarySerializationContext context)
    {
        var count = System.Convert.ToUInt32(value);
        return count - 1;
    }
}

// ...

[FieldOrder(1)]
public uint NumberOfPointers { get; set; }

[FieldOrder(2)]
[FieldCount(nameof(NumberOfPointers)), typeof(PlusOneConverter)]
public List<uint> Pointers { get; set; }

But it works only for FieldEndianness. I don't see second argument in FieldCount attribute.

[jefffhaynes]

Sorry, fixed. I was missing ConverterType =

Endianness has it a default parameter b/c the attribute doesn't make sense without it (not meaningful to bind to an "endianness" field).